Gas-fired boiler.



No. 754,095. PATENTED MAR, 23, 1904.

v A. SAHLIN.

GAS FIRED BOILER.

APPLICATION FILED SEPT. e, 1902. no MODEL. izsnnnTs-snnm 1;

No. 754,095 PATEN'IEDMAR. s, 1904.

/ I A. SAHLIN,

" GAS FIRED BOILER.

APPLICATION FILED SEPT. s, 1902.

no MODEL. 2 SHEETS-SHEET 2.

Patented March 8, 1904.

PATENT OFFICE.

AXEL SAHLIN, OF MILLOM, ENGLAND.

GAS-FIRED BOILER.

SPECIFICATION forming part of Letters Patent No. 754,095, dated March 8, 1904.

Application filer September 6, 1902- Serial No. 122,435. (No model.)

To aZZ whom it may concern.-

Be it known that I, AXEL SAHLIN, manager of iron-works, acitizen of the United States of America, residing at Millom, in the county of Cumberland, England, have invented certain new and useful Improvements Relating to Gas- Fired Boilers, of which the following is a specification.

Hitherto it has been the prevailing practice when firing boilers with blast-furnace gas to attach to the front end of the fines a hood connected withthe gas-main and provided with an air-inlet, the gas and cold air being introduced through this hood directly into the boiler-fines. This practice does not permit the gas and air to thoroughly mix or expand, with the result that combustion is imperfect and takes place partly after the gas has left the boiler, thus rendering the operation of the boiler unsatisfactory and uneconomical.

The object of this invention is to overcome the above-mentioned disadvantages by providing a separate self-contained circular mixing and combustion chamber for the air and gas, said chamber being adapted to be connected to existing boilers without disturbing their existing attachments or connections, such as gage-glasses, feed-valves, and manholes. By self-contained I imply that the combustionchamber is capable of standing by itself in any'position where it may be placed without requiring to be supported by or built onto any external support, and it can be moved about in its entirety without dismounting any of its structural parts and reerected by merely standing it down in any convenient position. This mixing and combustion chamber is preferably constructed of steel or iron plates lined with fire-brick and is provided with conveniently-placed adjustable air-inlets. The top of the chamber communicates, through a suitable inverted bell-shaped valve, with the gasmain. The chamber is also provided with a fire-grate, fire-door, and ash-pit door, which may be employed with solid fuel in place of the gas firing, if required. I find that it is particularly advantageous to admit the gas into the top of the chamber and air from ra dial or lateral openings surrounding the descending stream of gas in said chamber. The

seating of the gas-valve is provided with an annular space, into which dust can fall from the bell-valve and walls of the valve-casing when the valve is closed, and thereby form a packing. The chamber is connected to the boiler-fiues or combustion-room by fire-bricklined flues.

In order that my invention may be more clearly understood and readily carried into effect, I will proceed to describe the same more fully in connection with the accompanying drawings, in which Figure 1 is a partly-sectional elevation of part of a Lancashire boiler provided with a combustion-chamber in accordance with my invention. Fig. 2 is a plan of the apparatus shown in Fig. 1. Fig; 3 is a sectional side elevation, and Fig. a is a horizontal sectional view, showing the invention applied to a water-tube boiler.

The same reference-letters indicate like or similar parts in all the figures.

a is the combustion-chamber, constructed of metal plates lined with fire-brick and provided with air-inlets ,7) b and a gas-inlet c. A pipe cl, controlled by a conical valve 6, having an upturned edge, connects the inlet 0 with the gas-main f. The air-inlets 6 I) are regulated by circular shutters Z) I), constructed in the well-known manner and adapted to be. operated by levers 5 The seat of the valve 6 is provided with an annular recess 6, into which dust may fall from the valve and from the sides of theby pulling the chain 6 and when the said chain is released the valve falls by gravity upon its seat and is thus closed. The valvecasing is provided with a door 0 for the inspection and repair of the valve or any other required purpose.

At the base of the chamber a may be placed a fire-grate g, a fire-door g, and an ash-pit door g the latter only being an essential part of the chamber.

h h are the flues connecting the chamber a with the fines of the boiler 5. Each of the fines it is made in two sections united by an angle-iron connection it, and the section of each of said flues which is nearest the boiler is connected to the boiler by an angle-iron k After removing the bolts from the flanges of the angle-irons It If the section of the flue nearest the boiler may be removed without disturbing the combustion-chamber to permit repairs to be carried out or for any other required purpose.

When the valve 6 is opened and the inlets Z) I) have been adjusted to admit the required proportion of atmospheric air, the descending stream of gas is met by and thoroughly mixes with the air, an eflicient combustion being thus obtained in the chamber a. The mixed gas and air and the products of combustion are then conducted by the fines h to the combustion-room or flues of the boiler.

hat I claim, and desire to secure by Letters Patent of the United States, is

1. The combination with a blast-furnace, and a boiler-furnace, of a combustion-chamber connecting the blast-furnace and the boiler- :t'urnace, and comprising a portable circular metallic shell having a central gas-inlet at its top, radial inlets in its sides, and an escapeopening near the bottom below the radial airvalve provided with an annular space, and a door above the Valve to permit access to said valve.

2. The combination with a blast-furnace and a boiler-furnace, of a combustion-chamber connecting the blast-furnace and the boilerfurnace, and comprising a portable circular metallic shell having a central gas-inlet at its top, radial inlets in its sides, and an escapeopening near the bottom below the radial airinlets, fire-bricks forming an interior lining for the shell, valves for the radial air-inlets, a downwardly-seating valve for controlling the communication between the blast-furnace and the combustion-chamber, a seat for the valve provided with an annular space, a door above the valve to permit access to said valve, a fire-grate below the escape-opening and an ash-pit below the grate.

In testimony whereofI have hereunto set my AXEL SAHLIN.

Witnesses:

T. SULLY WVARDLE, GEORGE I. BRIDGES. 

